[5218] in linux-scsi channel archive
Linux 4mm SCSI DAT Drive Settings
daemon@ATHENA.MIT.EDU (Martin Gallant)
Thu Nov 26 21:55:35 1998
From: Martin Gallant <martyg@wired.ml.org>
Date: Thu, 26 Nov 1998 18:45:43 -0600 (CST)
To: amanda-users@amanda.org, linux-scsi@vger.rutgers.edu
Hi! I've been running amanda on my home network for about six months
now with a great deal of success. Saved my bacon a couple of times.
I have a couple of hardware tuning questions I have not been able to
find a definite answer to by scouring the 'net and my own testing.
I therefore turn to your expertise.
My system:
- GNU/Linux i386 Debian v2.0.2, 2.0.3[3456] and 2.1.128 kernels
- amanda-2.4.0, GNUTAR, software compression, 1Gig holding disk
- WangDAT 3400DX (DDS-1/2, 4Gig native capacity) F/W v1.5a
- Adaptec 2940 (narrow) SCSI controller
- Tape drive hardware compression turned off
Q1. By default, the system comes up with the driver configured in fixed
block mode (512 bytes). Should I be setting the driver to variable
block mode? (mt -f /dev/nst0 setblk 0) Will this impact
interoperability with other drives if I ever need to move my tapes?
Q2. When I load a 60m/90m DDS-1 cartridge into the drive, "mt status"
reports density code 0x13 (DDS-1). When I load a 120m DDS-2
cartridge, the reported setting does NOT change. Is this normal? I
expected the reported density to change to 0x24 (DDS-2). The reason
I ask is I cannot get better than 2.5Gig native capacity on a DDS-2
cartridge and I suspect the drive may be stuck in DDS-1 mode. This
one has me stumped, I sure could use some advice on this issue.
Q3. My nightly reports indicate transfer speeds on large (100's Megs,
all fit on holding disk) level 0 dumps to be around 250kB/sec. The
drive is rated at 350kB/Sec. Are there obvious things I can do to
this thing to tune for a better transfer rate?
Q4. Any other hints/tips for this setup?
Many thanks for a most excellent backup/restore package. Cheers!
--
Marty
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